// list_tracked_files.rs

//

// Copyright 2020 Antoine Cezar <antoine.cezar@octobus.net>

//

// This software may be used and distributed according to the terms of the

// GNU General Public License version 2 or any later version.

use crate::errors::HgError;

use crate::repo::Repo;

use crate::revlog::changelog::Changelog;

use crate::revlog::manifest::{Manifest, ManifestEntry};

use crate::revlog::node::Node;

use crate::revlog::revlog::RevlogError;

use crate::utils::hg_path::HgPath;

use rayon::prelude::*;

/// List files under Mercurial control in the working directory

/// by reading the dirstate

pub struct Dirstate {

    /// The `dirstate` content.

    content: Vec<u8>,

}

impl Dirstate {

    pub fn new(repo: &Repo) -> Result<Self, HgError> {

        let content = repo.hg_vfs().read("dirstate")?;

        Ok(Self { content })

    }

    pub fn tracked_files(&self) -> Result<Vec<&HgPath>, HgError> {

        files.par_sort_unstable();

        Ok(files)

    }

}

/// List files under Mercurial control at a given revision.

pub fn list_rev_tracked_files(

    repo: &Repo,

    revset: &str,

) -> Result<FilesForRev, RevlogError> {

    let rev = crate::revset::resolve_single(revset, repo)?;

    let changelog = Changelog::open(repo)?;

    let manifest = Manifest::open(repo)?;

    let changelog_entry = changelog.get_rev(rev)?;

    let manifest_node =

        Node::from_hex_for_repo(&changelog_entry.manifest_node()?)?;

    let manifest_entry = manifest.get_node(manifest_node.into())?;

    Ok(FilesForRev(manifest_entry))

}

pub struct FilesForRev(ManifestEntry);

impl FilesForRev {

    pub fn iter(&self) -> impl Iterator<Item = &HgPath> {

        self.0.files()

    }

}